Add missing clean rules

do libtool cleanup in src/afsd, src/kauth, and src/venus
remove ordinary objects in src/opr

Change-Id: Iddf6bb017a38e20e971b9faf576ee2f9e39625c0
Reviewed-on: http://gerrit.openafs.org/10262
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>